Modelling and simulation of a porous core photonic crystal fibre for terahertz wave propagation

Yakasai, Izaddeen Kabir; Abas, Pg Emeroylariffion; Ali, Sharafat; Begum, Feroza

doi:10.1007/s11082-019-1832-x

Cited by 40 publications

(36 citation statements)

References 33 publications

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“…Applications such as in-vivo THz imaging may require the fibre to deliver a large beam of THz light. Effective area A eff is a quantification of the area covered by the fundamental mode and it can be expressed by using the following [6,21]:…”

Section: Simulation Resultsmentioning

confidence: 99%

Design and simulation of rotated hexagonal porous core photonic crystal fibre with improved effective material loss and dispersion properties

Yakasai¹,

Abas²,

Shamsuddin³

et al. 2020

IJEECS

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A thorough modal characterization, centred on the full vectorial finite element method (FEM) has been used to model and numerically investigate a porous core photonic crystal fibre (PC-PCF), which may potentially be integrated into Terahertz (1012 Hz) compact systems. The proposed fibre consists of a rotated hexagonal core surrounded by a conventional hexagonal cladding. It has been shown that effective material loss (EML), core power fraction and dispersion profile are 0.019 cm-1, 51.7% and 0.5 ± 0.04 ps/THz/cm within 1 THz bandwidth, respectively. Based on simulated results and noncomplex design, it is envisaged that the proposed fibre can be realised for industrial THz applications.

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Section: Simulation Resultsmentioning

confidence: 99%

Design and simulation of rotated hexagonal porous core photonic crystal fibre with improved effective material loss and dispersion properties

Yakasai¹,

Abas²,

Shamsuddin³

et al. 2020

IJEECS

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“…Considering that dry-air is the most transparent terahertz medium, air-core waveguides with different cladding structures (simple hollow-core waveguides [23], [24], metalcoated dielectric waveguides [25] and photonic crystal hollowcore waveguides [26]), have drawn significant attention. Continuous effort is being brought to improve the transmission efficiency through new designs and materials [27], [28]. In this work, a thin-wall hollow-core Polypropylene waveguide is selected to be implemented due to its simple structure, low-loss propagation properties of the cladding material and availability in the commercial market.…”

Section: B Waveguide For Remote Sensingmentioning

confidence: 99%

Guided Reflectometry Imaging Unit Using Millimeter Wave FMCW Radars

Pan¹,

Chopard²,

Fauquet³

et al. 2020

IEEE Trans. THz Sci. Technol.

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Frequency Modulated Continuous Wave (FMCW) radar systems in the millimeter and sub-millimeter range are technologically mature for many applicative fields such as automotive and aerospace industries for imaging and non destructive testing. This work reports on a new implementation of a guided FMCW radar reflectometry unit for sensing and imaging applications. Only a terahertz dielectric waveguide is used for signal transmission between the transceiver module and the sample, thus drastically simplifying the experimental setup. Compared to continuous wave guided systems, one of the main advantages granted by the use of FMCW radars in combination with waveguides, is the differentiation capability between the reflected signals generated along the wave guide as parasitic signals or at its probing end as sensing information and therefore improving the expected signal-to-noise ratio. This innovative approach is demonstrated by using a dielectric hollowcore waveguide integrated with two different radar transceivers; the high-performance, III-V based 100 GHz SynView unit as a reference system and a compact, low-cost, PCB-Integrated, 122 GHz transceiver developed by Silicon-Radar GmbH. Both 3D electromagnetic simulations and raster scans are performed to investigate quantitatively the propagation behaviors including the coupling capabilities, dynamic range limitations, beam profile and induced artefacts of the guided FMCW reflectometry system. The feasibility of a simplified guided terahertz FMCW reflectometry probing unit is proven. The integration of a solid immersion lens at the end of the waveguide is also demonstrated for imaging resolution improvement.

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“…This also shows the superiority of the QE design in terms of the core power fraction. The power fraction is a quantification of the fractional mode power propagating through the certain regions of a PC-PCF, and it is calculated as follows [41]:…”

Section: Comparison Of Te Qe and Pe Geometriesmentioning

confidence: 99%

“…However, only waveguide dispersion is considered in this work, given that Zeonex has negligible dispersion in the frequency region of interest. The dispersion was calculated by using the following equation [41]:…”

Section: Comparison Of Te Qe and Pe Geometriesmentioning

confidence: 99%

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Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids

et al. 2019

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A porous-core photonic crystal fiber based on a cyclic olefin homopolymer (Zeonex) is proposed; it shows high birefringence, high core power fraction, low losses, and near-zero flat dispersion. The fiber’s core was designed with quad-elliptical (QE) air holes with its center occupied by bulk background material. The superiority of the QE design over the commonly adopted tri- and penta-elliptical (TE and PE) core designs is demonstrated. The presence of the bulk material at the core center and the geometrical configuration cause a broad contrast in phase refractive indices, thereby producing high birefringence and low transmission losses. A high birefringence of 0.096 was obtained at 1.2 THz, corresponding to a total loss of 0.027 cm−1 and core power fraction of approximately 51%. The chromatic dispersion and effective area of the reported fiber were also characterized within a frequency range of 0.4–1.6 THz. The QE air holes were then filled with chemical warfare agents, namely, tabun and sarin liquids. Then, the relative sensitivity, confinement loss, fractional power flow, and effective material loss (EML) of the sensor were calculated. Nearly the same relative sensitivity (r = 64%) was obtained when the QE core was filled with either liquid. Although the obtained EML for tabun was 0.033 cm−1 and that for sarin was 0.028 cm−1, the confinement loss of the fiber when it was immersed in either liquid was negligible. The proposed fiber can be fabricated using existing fabrication technologies. Moreover, it can be applied and utilized as a THz radiation conveyor in a terahertz time domain spectroscopy system for remote sensing of chemical liquids in the security and defense industries.

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Modelling and simulation of a porous core photonic crystal fibre for terahertz wave propagation

Cited by 40 publications

References 33 publications

Design and simulation of rotated hexagonal porous core photonic crystal fibre with improved effective material loss and dispersion properties

Design and simulation of rotated hexagonal porous core photonic crystal fibre with improved effective material loss and dispersion properties

Guided Reflectometry Imaging Unit Using Millimeter Wave FMCW Radars

Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids

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